package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.*;

/**
 * @author 山顶洞人郑某
 * @className ReportServiceImpl.java
 * @date 2024 02 25
 */
@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private WorkspaceService workspaceService;
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    /**
     * 统计指定区间内的营业额数据
     *实际上就是查询订单表的订单数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end时间内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        //当天的营业额
        List<Double> turnoverList  = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //日期计算
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        for (LocalDate date : dateList) {
            //当天营业额为当天已经完成的订单总金额
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN); //获取当天0点0分0秒
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);//获取当天最晚时间11点59分59秒
            Map<String , Object> map = new HashMap<>();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);//已完成订单
            Double turnover =  orderMapper.sumByMap(map);
            if (turnover == null){
                turnover = 0D;
            }
            turnoverList.add(turnover);
        }
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,",")).build();
    }

    /**
     * 用户统计
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end时间内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        //当天总的用户数量
        List<Integer> totalUserList = new ArrayList<>();
        //当天新增用户数量
        List<Integer> newUserList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //日期计算
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map<String,Object> map = new HashMap<>();
            map.put("end",endTime);
            Integer totalUser = userMapper.countByMap(map);
            totalUserList.add(totalUser);
            map.put("begin",beginTime);
            Integer newUser = userMapper.countByMap(map);
            newUserList.add(newUser);
        }
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .build();
    }

    /**
     * 订单统计
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end时间内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //日期计算
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        List<Integer> orderCountList = new ArrayList<>(); //每天的订单数
        List<Integer> validOrderCountList = new ArrayList<>();//每天有效订单数
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            HashMap<String ,Object> map = new HashMap<>();
            map.put("begin",beginTime);
            map.put("end",endTime);
            orderCountList.add(orderMapper.countBymap(map));
            map.put("status",Orders.COMPLETED);
            validOrderCountList.add(orderMapper.countBymap(map));
        }
        //时间区间内的订单总数
        int totalOrderCount = 0;
        for (Integer integer : orderCountList) {
            totalOrderCount+=integer;
        }
        //完成订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        //订单完成率
        double orderCompletionRate = 0.0;
        if (totalOrderCount != 0){
            orderCompletionRate = validOrderCount.doubleValue()/totalOrderCount;
        }

        OrderReportVO reportVO = OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .validOrderCount(validOrderCount)
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
        log.info("订单统计信息为,{}",reportVO);
        return reportVO;
    }

    /**
     * 获取销量前10
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {

        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        // select od.name,sum(od.amount) as amount from order_detail od,
        // orders o where o.status = 5 and o.order_time >2024-01-1 and
        // od.order_id = o.id group by od.name order by amount desc limit 0,10 分页查询
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        List<String> nameList = new ArrayList<>();
        List<Integer> numberList = new ArrayList<>();
        for (GoodsSalesDTO goodsSalesDTO : salesTop10) {
            nameList.add(goodsSalesDTO.getName());
            numberList.add(goodsSalesDTO.getNumber());
        }

        return SalesTop10ReportVO.builder()
                .numberList(StringUtils.join(numberList,","))
                .nameList(StringUtils.join(nameList,","))
                .build();
    }

    /**
     * 导出运营数据
     *
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {

        //1. 查询数据库，获取营业数据---查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2. 通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = null;
            if (in != null) {
                excel = new XSSFWorkbook(in);
            }

            //获取表格文件的Sheet页
            assert excel != null;
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);

            //获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3. 通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}
